Telephone-receiver



Patented May I6, I899.

W y :LILIF u Frrfll P. '0. BURNS. TELEPHONE RECEIVER.

(Apphcatxon filed Feb 28 1899) UNITED STATES PATENT OFFICE.

PETER O. BURNS, OF CHICAGO, ILLINOIS.

TELEPHONE-RECEIVER.-

SPECIFICATION forming part of Letters Patent N 0. 625,142, dated May '16, 1 899. Application filed February 23, 1899. $erial No. 706,479. (No model.)

To all whom it may concern:

Be it known that I, PETER 0. Bonus, a citizen of the United States of America, and a resident of Chicago, Cook county, Illinois, have invented certain new and useful .Improvements in Telephone-Receivers, of which the following is a specification.

My invention relates to certain structural improvements in telephone-receivers.

A telephone receiver is an instrument or piece of apparatus which is placed to the ear in order to receive the sounds transmitted by an instrument called the transmitter.

A telephone-receiver ordinarily comprises in construction a shell of insulating material, a permanent magnet disposed within the shell, a diaphragm acted upon bythe permanent magnet, a cap or mouthpiece screwed onto the shell, and binding-posts at the end of the structure opposite to the mouthpiece to which the circuit-wires are attached, and which circuit-wires are led through the shell to coils held upon the permanent magnet.

The object of my invention is to provide means by which the permanent magnet and associated parts mounted thereon maybe securely and conveniently held removably within the shell.

My invention has certain other objects in view; and it consists in certain features about to be described, reference being now had to the accompanying drawings, in which Figure 1 is a central longitudinal sectional view of a telephone-receiver embodying my improvements. Fig. 2 is a like view, except that the parts are shown removed and separated and positioned .for assemblage;

The shell of the receiver is designated at A, of suitable insulating material. The permanent magnet B, of ordinary construction, is disposed within the shell A in the ordinary way. The coils D, mounted upon the usual soft-iron extensions D are held on the ends of the permanent magnets B in the usual Way. The diaphragm is designated at E and the cap at H. The cap H is screwed upon the shell A in the usual manner. The binding-posts J are carried upon an insulatingpiece J secured to the permanent magnet 13,

and the leads J 3 extend from the said binding-posts through the shell A to the coils D.

The particular feature of my invention resides in the means for removably holding the magnets and accessories within the shell in conjunction with the diaphragm. To accomplish this end,'I provide the cup-shaped head K, which is secured to the end of the mag net B opposite to the end thereof having the binding-posts J. This cup-shaped head has an annular flange K and the coils D are disposed within the recess or cavity of said cupshaped head.

Referring to Fig. 2, it will be observed that the magnet B and its accessories are shown partially removed from the shell A, and it is evident that the magnet and its accessories may be entirely removed from the shell. To position the magnet and its accessories within the shell,'the'end of the magnet carrying the binding-posts is inserted within the open mouth of the flaring end of the shell and then pushed into position with the binding-posts extending beyond the other open end of the shell when the fiangeK of the head K be comes seated upon the annular flared end portion of the shell, as shown in Fig. 1. The diaphragm and cap are then positioned and the cap screwed upon the shell. is done, the diaphragm rests upon the flange K of the head and the said flangerests upon the end of the shell. The cap being screwed down tightly confines and holds the head and When this.

magnet attached securely in position, and the diaphragm is also so securely held. By this means the magnet carrying the binding-post, the connections, and the coils may be all bodily removed from the interior of the shell when the cap is unscrewed and removed from that end of the shell having the flaring portion thereon. The conical head and its annular flange provide means for securing the magnet and accessories firmly in position by simply screwing the cap upon the shell.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

In a" telephone-receiver the combination with the shell, of a magnet having a head thereon, and an annular flange 0r rim on the Signed by me, at Chicago, Cook county, I1lihetd agapted t0 enlgage Elie edge oftthedshell, nois, this 14th day of February, 1899.

a lap ragm over ying e lnagne an sup- 7 ported on said flange or rim, and a cap over- PETER BURNS lying the diaphragm, and secured directly to WVitnesses:

the shell, whereby the diaphragm and magnet CHAS. O. BULKLE Y,

are secured together in position. L. M. BULKLEY. 

